Just a little data point.
You will have ABSOLUTELY NO CHANCE (ok <5%) of getting into a lounge at EDI with a priority pass card between 7&7, midweek between march and november.
Unless you prebook, if they even let you that is.
Either fly business or pay the £30-£50 each to book entry. Or just go to the 'spoons or one of the other restaurants. Dont rely on amex plat or premium pass.
EDI Is one busy airport nowadays.